SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98e1b4504ca0aa26aa16ed77c2a8efaa253b40ff9269bfafe838e1cf1203c974' 
  AND token = 'rc3JDZX9fgszdg3CXEj+rfutJWqFms4KZr+tkB46G/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}